You can also use a character class in a regex: 
unless ($choice =~ /^[arode]$/) {

[download]

Also, some people prefer List::Util::none to negated grep: 

use List::Util qw{ none };
if (none { $_ eq $choice } qw( a r o d e )) {

[download]
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re^4: help with user selected hash operations? by choroba
in thread help with user selected hash operations? by lunette

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